A Punitive-Damages Award Facing Constitutional Review: Could the Court Affirm, Reverse, Vacate, or Modify the Result?

Yes. The U.S. Supreme Court has authority to affirm, reverse, vacate, or modify a judgment that includes punitive damages.

In this case, however, Monsanto seeks vacatur and remand based on federal preemption—not direct constitutional review of the award's size. A jury awarded Mike Dennis $7 million in compensatory damages and $325 million in punitive damages after finding that Monsanto's failure to warn about Roundup substantially caused his non-Hodgkin lymphoma. The trial court reduced the punitive award to $21 million, producing a $28 million judgment.

What is the Supreme Court reviewing?
Why could preemption eliminate the damages?
What outcomes are available?
Where does constitutional punitive-damages review fit?

What is the Supreme Court reviewing?

The pending case is *Monsanto v. Dennis*, No. 26-139. Monsanto argues that federal pesticide law preempts Dennis's state failure-to-warn claims because the Environmental Protection Agency did not require the cancer warning at issue.

That argument rests on the Supreme Court's June 2026 decision in *Monsanto v. Durnell*. There, the Court held that the Federal Insecticide, Fungicide, and Rodenticide Act, known as FIFRA, preempts a state claim requiring a Roundup cancer warning that the EPA did not require. Monsanto's petition asks the Court to vacate the California judgment and send the case back for reconsideration under *Durnell*. According to the Supreme Court docket, Dennis responded on September 2, 2026, and the petition was distributed for the September 28 conference.

Why could preemption eliminate the damages?

Dennis prevailed on failure-to-warn theories. If FIFRA bars those theories, the legal basis for both the compensatory and punitive awards could disappear. Punitive damages punish and deter especially wrongful conduct, but they ordinarily depend on an underlying claim that supports liability.

A court generally cannot preserve punishment for conduct when federal law prevents the plaintiff from imposing liability for that conduct through the successful state-law theory. The Supreme Court's opinion in *Durnell* therefore matters beyond the warning label itself. Applied to Dennis's claims, it could require California courts to set aside the entire $28 million judgment rather than merely reduce its punitive component.

What outcomes are available?

The Court has several procedural options, but they do not carry the same meaning: Federal law expressly permits an appellate court to affirm, modify, vacate, set aside, or reverse a judgment and remand with appropriate instructions. Those powers appear in 28 U.S.C.

§ 2106. A grant-vacate-remand order is the relief Monsanto expressly requests. It would not necessarily end the litigation immediately; the California courts would first determine how *Durnell* affects Dennis's claims and damages.

Deny review: The $28 million judgment remains in place, but the denial does not affirm the California court's reasoning on the merits.
Grant, vacate, and remand: The Court nullifies the appellate judgment and directs California courts to reconsider it under *Durnell*.
Grant full review and affirm: The Court leaves the judgment standing after deciding the merits.
Reverse: The Court rejects the California judgment and may direct a result consistent with its legal ruling.
Modify: The Court changes the judgment itself, although Monsanto is not currently asking it to recalculate punitive damages.

Where does constitutional punitive-damages review fit?

The California Court of Appeal affirmed the reduced $21 million punitive award. It concluded that the three-to-one ratio between punitive and compensatory damages adequately reflected Monsanto's reprehensible conduct, earlier punitive awards, and subsequent actions without violating due process. When courts conduct constitutional review of punitive damages, they examine the defendant's degree of reprehensibility, the award's relationship to actual or potential harm, and comparable civil or criminal sanctions. Review is de novo, meaning the reviewing court independently evaluates the constitutional question instead of deferring to the lower court. No fixed ratio automatically decides constitutionality.

The Supreme Court has nevertheless said that few punitive awards substantially exceeding a single-digit ratio will satisfy due process, as explained in *State Farm v. Campbell*. Dennis's reduced award has a three-to-one ratio: $21 million in punitive damages compared with $7 million in compensatory damages. But the pending petition places preemption first. If federal law eliminates the underlying claims, the Court need not decide whether that ratio is constitutionally permissible.